Die-stock



UNITED sTATEs PATENT oEEioE.

JAMES TEACHOUT, OF VVATERFORD, NEXV YORK.

DIE-STOCK.

Specification of Letters Patent No. 17,707, dated June 30; 1857.

T o all whom it may concern:

Be it known that I, JAMES TEAcHoU'r, of Waterford, in the county ofSaratoga and State of New York, have invented a new and improvedscrew-cutting die-stock of that class in which all the dies used,whether two, three, or more, are simultaneously and equally slid in aradial direction within the die-stock in tightening them on a rod orbolt they may be cutting; and I do hereby declare that the following isa full, clear, and exact description of the same, reference being h adto the annexed drawings, making a part of this specification, in which-Figure 1 is an isometrical projection of a die-stock made according tomy invention-w a part of the guard-plate E being broken away; Fig. 2 alongitudinal section of the entire stock; Fig. 3 an isometricalprojection of the central portion of the die-stock; the scroll-plate D,by which the screw-cutting dies C are operated and the guard plate Ebeing both removed; Fig. 4 a plan of the scroll side of the plate D;Fig. 5 a central cross-section of the scroll-plate; Fig. 6 anisometrical projection of a wrench which may be used in turning thescroll-plate7 and in turning the buttons a, a', by which the guard-plateis held to the stock in such a manner that it can be easily removed;Fig. 7 an isometrical projection of one of the screw-cutting dies C;Fig. 8 an isometrical projection of the die-holder B, when made so thatit can be removed from the stock A, and Fig. 9 an isometrical projectionof the central part of the stock A, when thus made separate from thedie-holder.

The same letters refer to like parts in all the figures.

I prefer to make the dies C of my improved die-stock of the rectangularform represented in the drawings; but dies which may be slid endwise ofsome other angular forms may be used. The stock A and the dieholder Bmay be made separate so that the die-holder can be removed from thestock, as shown by Figs. 8 and 9, or they may be cast together in onepiece; but in either case the die-holder is and must be so formed as togive firm support to the bottom b, to the sides c, and to only the frontor inner part d of the top of that ortion of the dies within the ways inthe ie-holder; and the dieholder thus made is and must be either allcast in one piece or formed of parts firmly united together. And also,the dies when thus formed and held in the stock are, and must be, allsimultaneously slid inward together to tighten them, and also outward toloosen them upon the rod or bolt they may be cutting by means of ascroll or cam plate acting against a lug, e, or its equivalent, formedupon or in the outer or back part of the top side of each die whichplate D is and must be so formed and held by a removable guard-plate Eor its equivalent that it can be turned about the hub f of the dieholderas a center by means of a lever inserted within radial grooves g in itstop side, or by some other similar arrangement; and that it (the scrollplate) shall, in forcing the dies inward, give firm support to the backor outer portion of the top of the dies; and that the scroll plate canbe quickly removed from the stock to change the dies when necessary.

The manner in which the stock A; and the die-holder, B, when madeseparate, are formed so as to have suflicient strength and to fittogether properly, is apparent from the drawings; and when the stock andthe die.

holder are cast together their combined structure may then be the samethat it would be if the loose die holder B was brazed in its placewithin 'the stock. When the die holder can not be separated from thestock to change the dies7 I prefer to arrange the dies so that all theirouter ends are opposite to the rim h, and to then continue the ways forthe dies through the rim, as is indicated by the dotted lines at t inFig. 9; so that the dies can be changed by sliding them out and in atthe o en outer ends of the ways, the

same as w en the die-holder is removed from the stock; instead of makingthe stock larger and changing the dies through the opening in the top ofthe ways as must be done if the rim h is whole and the die-holder andstock are fast together.

Instead of the lug e, a groove may be made in and across the top of eachdie, to fit the scroll or cam in the plate D when correspondinglyvaried; and, instead of making the scroll of the plate D with 2 or moreconvolutions, it need have -but one; or there may be a separate camgroove or feather for eac die.

I am aware that the dies, in stocks of the class to which mine belongs,have been heretofore slid radially inward and outward together, by meansof a scroll or cam plate acting against lugs uponV or within grooves in,the top side of the dies, in the same manner that the dies in myimproved stock are slid radially inward and outward; but l believe, thatin such cases, the inner portion of the top side of the dies,-where thegreatest upward strain is exerted by the dies in cutting screws, andWhere the dies should have an unyielding support, are only sustained bythe removable guard plate, or the loose scroll plate held by the guardplate;- the scroll plate being thus subjected to much friction andconsequentrwear, and the guard plate to great strain, while the dies arebut poorly held in their places for cutting Screws accurately.

JAMES TEACHOUT.

Witnesses:

i J. H. CUDwoRTH, AUSTIN F. PARK.

